VLZ4V7B-GS18 Equivalent & Substitute Parts

Part Overview

The VLZ4V7B-GS18 is a Zener Diode rated at 4.68 V with 500 mW power dissipation in a SOD-80 QuadroMELF surface mount package, manufactured by Vishay General Semiconductor - Diodes Division. This component is classified as Obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement. The part carries AEC-Q101 automotive qualification and is ROHS3 compliant, making it suitable for automotive-grade applications requiring voltage regulation and protection circuits.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	4.68	V
Power - Max	500	mW
Impedance (Max)	25	Ohms
Current - Reverse Leakage @ Vr	6	µA @ 2 V
Voltage - Forward (Vf) (Max) @ If	1.5	V @ 200 mA
Operating Temperature Range	-65 to 175	°C
Mounting Type	Surface Mount	-
Package / Case	SOD-80 QuadroMELF	-
Grade	Automotive	-
Qualification	AEC-Q101	-

Substitute Part Grouping Explanation

Substitution of the VLZ4V7B-GS18 is determined by the following critical parameters: nominal Zener voltage, maximum power dissipation, operating temperature range, mounting type, and package compatibility. The substitute parts identified fall into two categories based on these criteria.

Category 1: Direct Manufacturer Alternative (Same Manufacturer) The TLZ4V7B-GS18 from Vishay General Semiconductor - Diodes Division shares the same manufacturer lineage and maintains electrical equivalence within acceptable tolerances. This part operates at 4.7 V nominal Zener voltage (compared to 4.68 V), maintains 500 mW power rating, and operates across the identical temperature range. The primary difference is packaging format: TLZ4V7B-GS18 uses SOD-80 MiniMELF versus the QuadroMELF variant of the original part. Both are surface mount configurations with equivalent electrical performance.

Category 2: Cross-Manufacturer Alternatives (Microchip Technology) The 1N5230BUR, 1N5230BUR-1, and 1N750AUR-1 from Microchip Technology provide functional equivalence with the following considerations: all three maintain 4.7 V nominal Zener voltage and 500 mW power dissipation across the -65°C to 175°C operating range. These parts use DO-213AA packaging instead of SOD-80, requiring PCB layout modification. Electrical parameters including impedance and forward voltage characteristics differ slightly but remain within acceptable substitution ranges for voltage regulation applications.

Parameter Comparison

Parameter	VLZ4V7B-GS18	TLZ4V7B-GS18	1N5230BUR	1N5230BUR-1	1N750AUR-1
Manufacturer	Vishay	Vishay	Microchip	Microchip	Microchip
Voltage - Zener (Nom) (V)	4.68	4.7	4.7	4.7	4.7
Tolerance	-	-	±5%	±5%	±5%
Power - Max (mW)	500	500	500	500	500
Impedance (Max) (Ohms)	25	25	19	19	15
Current - Reverse Leakage @ Vr (µA)	6 @ 2V	5 @ 1V	5 @ 2V	50 @ 2V	5 @ 1.5V
Voltage - Forward (Vf) (Max) @ If (V)	1.5 @ 200mA	1.5 @ 200mA	1.1 @ 200mA	1.5 @ 200mA	1.1 @ 200mA
Operating Temperature (°C)	-65 to 175	-65 to 175	-65 to 175	-65 to 175	-65 to 175
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOD-80 QuadroMELF	SOD-80 MiniMELF	DO-213AA	DO-213AA (Glass)	DO-213AA
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not specified	Not specified	RoHS non-compliant

Engineering Selection Recommendations

For Direct Replacement with Minimal PCB Modification: The TLZ4V7B-GS18 is the preferred substitute when design constraints permit. This part maintains active product status, carries ROHS3 compliance matching the original specification, and is manufactured by the same supplier. The SOD-80 MiniMELF package is mechanically compatible with existing SOD-80 footprints on most PCB designs. Electrical performance is equivalent across all critical parameters.

For Cross-Manufacturer Substitution: The 1N5230BUR and 1N5230BUR-1 from Microchip Technology are functionally equivalent alternatives when package format change is acceptable. Both maintain active product status and provide the required electrical performance. The 1N5230BUR-1 offers higher inventory availability (1139 pieces) compared to 1N5230BUR (793 pieces). Selection between these two should consider reverse leakage current specifications: 1N5230BUR exhibits 5 µA @ 2V while 1N5230BUR-1 exhibits 50 µA @ 2V, which may impact circuit performance in low-leakage applications.

Alternative with Superior Impedance Characteristics: The 1N750AUR-1 provides the lowest impedance specification (15 Ohms maximum) among all substitutes, offering improved voltage regulation stability. However, this part carries RoHS non-compliant status, which may restrict use in applications with environmental or regulatory compliance requirements. This part is suitable only for designs where RoHS compliance is not mandated.

Compliance Considerations: For automotive-grade applications requiring AEC-Q101 qualification, the TLZ4V7B-GS18 maintains the original qualification status. Cross-manufacturer alternatives from Microchip Technology do not explicitly reference AEC-Q101 qualification in the provided specifications. Verification of automotive qualification status with the supplier is necessary for applications requiring this certification.

Frequently Asked Questions (FAQ)

Q: Can the TLZ4V7B-GS18 be used as a direct drop-in replacement for the VLZ4V7B-GS18?

A: The TLZ4V7B-GS18 is electrically equivalent and uses compatible SOD-80 surface mount packaging. Both parts operate at nominally equivalent Zener voltages (4.68 V vs. 4.7 V), maintain identical 500 mW power ratings, and share the same operating temperature range. The primary difference is the MiniMELF variant designation versus QuadroMELF; both are SOD-80 package types suitable for standard PCB footprints. Verification with your PCB layout tool is recommended to confirm footprint compatibility.

Q: What is the difference between the Microchip 1N5230BUR and 1N5230BUR-1?

A: Both parts are functionally equivalent 4.7 V, 500 mW Zener diodes in DO-213AA packaging. The primary electrical difference is reverse leakage current: 1N5230BUR specifies 5 µA @ 2V while 1N5230BUR-1 specifies 50 µA @ 2V. For applications sensitive to leakage current, the 1N5230BUR is the preferred choice. The 1N5230BUR-1 offers higher inventory availability.

Q: Why do the Microchip alternatives use DO-213AA packaging instead of SOD-80?

A: DO-213AA and SOD-80 are distinct package formats with different physical dimensions and PCB footprints. DO-213AA is a smaller axial lead package, while SOD-80 is a surface mount variant. Selection of Microchip alternatives requires PCB layout modification to accommodate the different package footprint. Consult your PCB design software to verify footprint compatibility before component selection.

Q: Are the Microchip alternatives suitable for automotive applications?

A: The provided specifications for Microchip parts (1N5230BUR, 1N5230BUR-1, 1N750AUR-1) do not explicitly reference AEC-Q101 automotive qualification. The original VLZ4V7B-GS18 carries AEC-Q101 qualification. For automotive-grade applications requiring this certification, contact the supplier to confirm qualification status of Microchip alternatives, or select the TLZ4V7B-GS18 which maintains the original qualification.

Q: What is the significance of the ±5% tolerance specification on Microchip parts?

A: The ±5% tolerance on Microchip Zener diodes indicates the acceptable variation in nominal Zener voltage from the specified 4.7 V value. This results in an operating range of 4.465 V to 4.935 V. The original VLZ4V7B-GS18 does not specify a tolerance value in the provided data. For applications requiring tighter voltage regulation, compare the tolerance specifications against your circuit requirements.

Q: Can the 1N750AUR-1 be used in designs requiring RoHS compliance?

A: No. The 1N750AUR-1 is specified as RoHS non-compliant. This part is unsuitable for applications subject to RoHS (Restriction of Hazardous Substances) regulations or customer requirements. Select either the TLZ4V7B-GS18 (ROHS3 compliant) or the Microchip 1N5230BUR and 1N5230BUR-1 alternatives for RoHS-compliant designs.

Q: What is the advantage of the 1N750AUR-1's lower impedance specification?

A: The 1N750AUR-1 specifies a maximum impedance of 15 Ohms compared to 25 Ohms for the original part and TLZ4V7B-GS18. Lower impedance provides improved voltage regulation performance and faster transient response in voltage regulation circuits. However, this advantage is offset by the RoHS non-compliant status, which restricts use in many modern applications.

Q: Is the original VLZ4V7B-GS18 still available for procurement?

A: The VLZ4V7B-GS18 is classified as Obsolete. While 918 pieces are listed as in stock, long-term availability cannot be guaranteed. Transition to an active substitute part is recommended for new designs and ongoing production requirements. The TLZ4V7B-GS18 is the recommended transition path due to manufacturer continuity and maintained compliance certifications.

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